<!DOCTYPE html>
<style>
iframe {
  position:absolute;
  top: 50px;
  left: 50px;
  width: 100px;
  height: 100px;
  transform-style: preserve-3d;
  transform: matrix3d(1,  0,  0,    0,
                      0,  1,  0,    0,
                      1,  0,  1,    0,
                      0,  0, -1000, 1);
}

</style>
<html>
<body>
<iframe src="/cross-site/baz.com/title1.html"></iframe>
This page contains a positioned cross-origin iframe with a non-flat transform applied to it.
</body>
</html>
